RE: General building Q, how to fill a low spot
I use the same stuff that the body shops use not bondo but the red putty fille. It's pretty cheap if you go to a Body Shop Supply Store. You can get it in a can or tube. Cans hold more and last longer. Its very easy to smooth to match the rest of the fuse around it. I've not found any other filler that sands as easy as this stuff!!! It's called finishing putty, but if you just say the red stuff, they will know what you mean! GOOD LUCK!
Gibbs